Pilot frequency acquisition based on a window of data samples

Details Pilot frequency acquisition based on a window of data samples Pilot frequency acquisition based on a window of data samples

2005-06-28

2005-06-28

Tse, Young T. (Department: 2637)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S147000, C375S326000, C375S344000, C375S355000

Reexamination Certificate

active

06912244

ABSTRACT:
Techniques to acquire the frequency of a signal instance based on a window of data samples covering a time period shorter than the time needed to achieve frequency lock. The window of data samples is initially captured and stored to a sample buffer. A segment of data samples is then retrieved from the sample buffer for processing. The retrieved data samples are rotated by a current frequency error estimate to provide frequency-translated data samples, which are further processed to provide one or more pilot symbols. An updated frequency error estimate for the frequency-translated data samples is then derived based on the pilot symbols using a frequency control loop. The window of data samples is processed for a number of iterations until frequency acquisition is achieved for the signal instance or termination is reached. For each iteration, one segment is processed at a time and typically in sequential order.

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Kajiwara A., et al. Spread Spectrum Demodulator Using Block Signal Processing 1991 IEEE pp. 0894-0898.

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